US20140069602A1 - Molding device for continuous casting equipped with agitator - Google Patents
Molding device for continuous casting equipped with agitator Download PDFInfo
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- US20140069602A1 US20140069602A1 US14/115,788 US201214115788A US2014069602A1 US 20140069602 A1 US20140069602 A1 US 20140069602A1 US 201214115788 A US201214115788 A US 201214115788A US 2014069602 A1 US2014069602 A1 US 2014069602A1
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- magnetic field
- field generation
- generation device
- casting mold
- melt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/004—Copper alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/112—Treating the molten metal by accelerated cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
Definitions
- the present invention relates to a molding device for continuous casting, which is equipped with an agitator, of continuous casting equipment that produces a billet, a slab or the like made of non-ferrous metal of a conductor (conductive body), such as Al, Cu, Zn, or an alloy of at least two of them, or an Mg alloy, or other metal.
- a conductor conductive body
- a melt agitating method to be described below has been employed in a casting mold for continuous casting. That is, for the improvement of the quality of a slab, a billet, or the like, in a process for solidifying the melt, that is, when the melt passes through the casting mold, a moving magnetic field, which is generated from the outside of the casting mold by an electromagnetic coil, is applied to the melt present in the casting mold so that agitation occurs in the melt not yet solidified.
- a main object of this agitation is to degas the melt and to uniformize the structure.
- the electromagnetic coil is disposed at the position close to high-temperature melt, the cooling of the electromagnetic coil and troublesome maintenance are needed and large power consumption is obviously needed.
- the generation of heat from the electromagnetic coil itself caused by the power consumption cannot be avoided, and this heat should be removed. For this reason, there are various problems in that the device itself cannot but become expensive, and the like.
- the invention has been made to solve the above-mentioned problems, and an object of the invention is to provide a molding device for continuous casting equipped with an agitator that reduces the amount of generated heat, is easy to carry out maintenance, is inexpensive, and is easy to use in practice.
- a molding device for continuous casting equipped with an agitator is a device which receives liquid-phase melt of a conductive material and from which a solid-phase cast product is taken out through the cooling of the melt.
- the molding device includes a casting mold including a casting space that includes an inlet and an outlet at a central portion of a substantially cylindrical side wall and a magnetic field generation device receiving chamber that is formed in the side wall and is positioned outside the casting space, the casting mold receiving the liquid-phase melt from the inlet into the casting space and discharging the solid-phase cast product from the outlet through the cooling in the casting space, and an agitator provided so as to correspond to the casting mold, the agitator including a magnetic field generation device having an electrode unit that includes first and second electrodes supplying current to at least the liquid-phase melt present in the casting space, and a permanent magnet that applies a magnetic field to the liquid-phase melt.
- the magnetic field generation device is received in the magnetic field generation device receiving chamber of the casting mold, generates magnetic lines of force toward a center in a lateral direction, makes the magnetic lines of force pass through a part of the side wall of the casting mold and reach the casting space, and applies lateral magnetic lines of force, which cross the current, to the melt.
- FIG. 1( a ) is a view illustrating the entire structure of an embodiment of the invention
- FIGS. 1( b ) and 1 ( c ) are explanatory views illustrating the operation thereof.
- FIG. 2( a ) is an explanatory plan view taken along line II(a)-II(a) of FIG. 1 and FIG. 2( b ) is an explanatory view illustrating the bottom of an outer casting mold.
- FIG. 3( a ) is an explanatory plan view of a magnetic field generation device 31 of an agitator 3
- FIG. 3( b ) is an explanatory plan view of a modified example thereof.
- FIG. 4( a ) is a plan view of another modified example of the magnetic field generation device 31 of the agitator 3
- FIG. 4( b ) is an explanatory plan view of a modified example thereof.
- FIG. 5 is a view illustrating the entire structure of another embodiment of the invention.
- FIG. 6 is a view illustrating the entire structure of another embodiment of the invention.
- FIG. 7 is a view illustrating the entire structure of still another embodiment of the invention.
- FIG. 8( a ) is a view illustrating the entire structure of yet another embodiment of the invention
- FIG. 8( b ) is a cross-sectional view taken along line VIII(b)-VIII(b) of FIG. 8( a )
- FIG. 8( c ) is a cross-sectional view taken along line VIII(c)-VIII(c) of FIG. 8( a )
- FIG. 8( d ) is an explanatory plan view of a magnetic field generation device
- FIG. 8( e ) is an explanatory plan view of a lid.
- FIG. 9( a ) is a view illustrating the entire structure of still another embodiment of the invention
- FIG. 9( b ) is a cross-sectional view taken along line IX(b)-IX(b) of FIG. 9( a )
- FIG. 9( c ) is an explanatory plan view of a magnetic field generation device.
- FIG. 10 is a view illustrating the entire structure of yet another embodiment of the invention.
- melt M of non-ferrous metal is discharged from a melt receiving box that is called a tundish and is poured into a casting mold that is provided on the lower side. Cooling water for cooling the casting mold is circulated in the casting mold. Accordingly, high-temperature melt starts to solidify from the outer periphery thereof (a portion thereof close to the casting mold) from the moment that the high-temperature melt comes into contact with the casting mold.
- melt which is positioned at the central portion of the casting mold, is distant from the wall of the casting mold that is being cooled, the solidification of the melt positioned at the central portion of the casting mold is obviously later than that of the melt positioned at the peripheral portion of the casting mold.
- two kinds of melt that is, liquid (liquid-phase) melt and a solid (solid-phase) cast product are simultaneously present in the casting mold while being adjacent to each other with an interface interposed therebetween.
- gas remains in the cast product (product) having been changed into a solid and causes the quality of the product to deteriorate. For this reason, degassing is facilitated by the agitating of the melt that is not yet solidified.
- the electromagnetic agitator which uses electricity as power, has been used for the agitating in the related art.
- the invention is to provide a molding device for continuous casting equipped with an agitator that does not use the electromagnetic agitator using electricity as power and uses permanent magnets.
- FIG. 1( a ) is an explanatory plan view taken along line II(a)-II(a) of FIG. 1( a ), and mainly illustrates a part of an agitator 3 and a casting mold 2
- FIG. 3( a ) is an explanatory plan view of the magnetic field generation device 31 of the agitator 3 .
- a device broadly includes a melt supply unit 1 that supplies melt M of non-ferrous metal of a conductor (conductive body), such as Al, Cu, Zn, or an alloy of at least two of them, or an Mg alloy, or other metal; a casting mold 2 that receives the melt from the melt supply unit 1 ; and an agitator 3 that agitates the melt M present in the casting mold 2 .
- a central portion of the casting mold 2 forms a so-called casting space 2 A( 1 ) that includes an inlet 2 A( 1 ) 1 and an outlet 2 A( 1 ) 2 .
- the melt supply unit 1 includes a tundish (melt receiving box) 1 A that receives melt M from a ladle (not illustrated) or the like.
- the melt M is stored in the tundish (melt receiving box) 1 A, inclusion is removed from the melt, and the melt M is supplied to the casting mold 2 from a lower opening 1 B of the tundish at a constant supply rate. Only the tundish (melt receiving box) 1 A is illustrated in FIG. 1 .
- the casting mold 2 is adapted in this embodiment so that a columnar product P (billet) is taken out from the casting mold.
- the casting mold 2 is formed so as to have a substantially cylindrical double structure (of which the cross-section has a ring shape). That is, the casting mold 2 includes an inner casting mold 21 and an outer casting mold 22 that are fitted to each other.
- the inner casting mold 21 is provided on the inside and made of a non-conductive material (non-conductive refractory material) such as graphite (carbon).
- the outer casting mold 22 is provided on the outside and made of a conductive material (conductive refractory material), such as aluminum or copper.
- the magnetic field generation device 31 is assembled so as to be received within the side wall of the outer casting mold 22 .
- the technical idea is the same as described above even when a prismatic product (slab) is taken out, the technical idea of an embodiment to be described below can be applied as it is. Briefly, the shapes of components corresponding to a rectangular slab, which is a product, are merely changed.
- the casting mold 2 further includes a water jacket 23 outside the outer casting mold 22 .
- the water jacket 23 is to cool the melt M that flows into the inner casting mold 21 . That is, cooling water flows into the water jacket 23 from an inlet (not illustrated) and is circulated in the water jacket 23 , the outer portion of the outer casting mold 22 is cooled by the cooling water, and the cooling water is discharged from an outlet (not illustrated). The melt M is rapidly cooled by the water jacket 23 . Since water jackets having various known structures may be employed as the water jacket 23 , the detailed description thereof will not be provided here.
- a plurality of electrode insertion holes 2 a , 2 a , . . . into which electrodes 32 A to be described below are inserted are formed at a predetermined interval on the circumference of the casting mold 2 having the above-mentioned structure.
- the electrode insertion holes 2 a are formed so as to be inclined downward toward the center of the casting mold 2 . For this reason, if the surface of the melt M is lower than the upper openings of the electrode insertion holes 2 a even though the melt M is contained in the casting mold 2 , there is no concern that the melt M will leak to the outside.
- the agitator 3 is provided so as to be built in the side wall of the casting mold 2 .
- the agitator 3 includes a permanent magnet type magnetic field generation device 31 , and a pair of upper and lower electrodes (positive and negative electrodes) 32 A and 32 B.
- the magnetic field generation device 31 is formed in the shape of a ring (in a frame shape).
- the entire inner peripheral portion of the magnetic field generation device may be magnetized to an N pole, and the entire outer peripheral portion of the magnetic field generation device may be magnetized to an S pole. Further, four portions of the inner and outer peripheral portions may be partially magnetized to an N pole and an S pole as illustrated in, for example, FIG. 3( a ), respectively.
- the magnetic field generation device 31 does not necessarily need to be formed in the shape of a ring, and may be divided. That is, for example, as illustrated in FIG. 8( d ), the cross-section of the magnetic field generation device may be formed of a plurality of arc-shaped permanent magnet pieces ( FIG. 4) . As briefly described above, particularly, as understood from FIG. 1( a ), the magnetic field generation device 31 is assembled in the outer casting mold 22 .
- the outer casting mold 22 includes a magnetic field generation device receiving chamber 22 a which is formed in the side wall thereof and has a ring-shaped cross-section and of which a lower portion forms a release port.
- the magnetic field generation device receiving chamber 22 a is also understood from FIG. 2( b ).
- FIG. 2( b ) is a view of the outer casting mold 22 when the outer casting mold 22 is seen from below. In particular, as understood from FIG.
- the magnetic field generation device 31 also having a ring-shaped cross-section is received in the magnetic field generation device receiving chamber 22 a , which has a ring-shaped cross-section and of which the lower portion is opened, from below so that the position of the magnetic field generation device in the vertical direction can be adjusted by movement. That is, the magnetic field generation device 31 is provided so that the height of the magnetic field generation device can be adjusted in the magnetic field generation device receiving chamber 22 a by desired units (not illustrated). Accordingly, it is possible to more efficiently agitate the melt M as described below by adjusting the height of the magnetic field generation device so as to correspond to liquid-phase melt M as understood from FIG. 1( a ).
- the lower opening of the magnetic field generation device receiving chamber 22 a is closed by a ring-shaped lid 22 B.
- the lid 22 B may be formed so as to include discharge channels 22 B ( 1 ) for discharging cooling water to the outside such as a lid 22 B of FIG. 8( a ) to be described below.
- the four portions of the magnetic field generation device 31 are magnetized and form pairs of magnetic poles 31 a , 31 a , . . . as illustrated in FIG. 3( a ). That is, a portion of each of the magnetic poles 31 a , 31 a facing the inside of the ring-shaped magnetic field generation device is magnetized to an N pole, and a portion thereof facing the outside of the ring-shaped magnetic field generation device is magnetized to an S pole. Accordingly, magnetic lines of force ML generated from the N pole horizontally pass through the melt M that is present in the casting mold 2 .
- the magnetization may be contrary to this. That is, the inner portions of all magnetic poles may be magnetized to a certain pole and the outer portions thereof may be magnetized to an opposite pole.
- One of additional characteristics of the invention is that a plurality of magnetic poles are disposed at a plurality of positions surrounding the melt M, which is not yet solidified, as understood from FIG. 3( a ). Accordingly, it is possible to improve the quality of the product P by agitating all the melt M with an electromagnetic force that is generated according to Fleming's rule by magnetic lines of force and current as described below. Therefore, the number of the magnetic poles is four in FIG. 3( a ), but is not limited to four and may be arbitrary.
- the magnetic field generation device 31 does not need to be formed of a ring-shaped single body, and may be divided into a plurality of magnet bodies (magnet pieces), of which the number is arbitrary, as illustrated in FIG. 8( d ).
- FIG. 1( a ) current flows between the pair of electrodes 32 A and 32 B through the melt M and a cast product (product) P.
- One electrode 32 A may be used, but a plurality of electrodes 32 A may be used. In this embodiment, two electrodes 32 A are used.
- the electrodes 32 A are formed in the shape of a probe.
- the respective electrodes 32 A are inserted into the above-mentioned electrode insertion holes 2 a . That is, the electrodes 32 A penetrate into the casting mold 2 (the inner casting mold 21 and the outer casting mold 22 ) from the water jacket 23 . Inner ends of the electrodes 32 A are exposed to the inside of the inner casting mold 21 , come into contact with the melt M, and conduct electricity to the melt M. Outer ends of the electrodes 32 A are exposed to the outside of the water jacket 23 . The outer ends are connected to a power supply 34 that can supply variable direct current.
- the power supply 34 may have the function of an AC power supply as described below, and may have a function of changing frequency.
- the electrodes 32 A may be supported above the upper opening of the casting mold 2 without penetrating the side wall of the casting mold 2 so that the inner ends of the electrodes 32 A are inserted into the melt M from the surface of the melt M flowing into the casting mold 2 .
- the electrodes 32 A may be electrically connected to the inner casting mold 21 made of graphite or the like.
- the number of electrodes used as the electrodes 32 A may be arbitrary, and an arbitrary number of the electrodes 32 A may be inserted into arbitrary electrode insertion holes of the electrode insertion holes 2 a , 2 a , . . . .
- the lower electrode 32 B is provided so that the position of the lower electrode 32 B is fixed.
- the electrode 32 B is formed of a roller type electrode. That is, the lower electrode 32 B includes a rotatable roller 32 Ba at the end thereof.
- the roller 32 Ba comes into press contact with the outer surface of a columnar product P as a cast product (a billet or a slab) that is extruded in a solid phase state. Accordingly, as the product P extends downward, the roller 32 Ba is rotated. That is, when the product P is extruded downward, the product P extends downward in FIG. 1 while coming into contact with the roller 32 Ba and rotating the roller 32 Ba.
- the power supply 34 is adapted so as to be capable of controlling the amount of current flowing between the pair of electrodes 32 A and 32 B. Therefore, it is possible to select current where the liquid-phase melt M can be agitated most efficiently in a relationship with the magnetic lines of force ML.
- a fixed amount of the melt M which is discharged from the tundish (melt receiving box) 1 A, is input to the upper portion of the casting mold 2 .
- the casting mold 2 is cooled through the circulation of water in the water jacket 23 , so that the melt M present in the casting mold 2 is rapidly cooled and solidified.
- the melt M present in the casting mold 2 has a two-phase structure where the upper portion of the melt is liquid (liquid phase), the lower portion thereof is solid (solid phase), and the upper and lower portions of the melt are adjacent to each other at an interface IT 0 .
- the melt M is formed in the shape (a columnar shape in this embodiment) corresponding to the shape of the casting mold. Accordingly, a product P as a slab or billet is continuously formed.
- the magnetic field (magnetic lines of force ML) of the magnetic field generation device reaches the melt M, which is present in the casting mold 2 , in the lateral direction.
- the current flows to the lower electrode 32 B from the upper electrodes 32 A through the melt (liquid phase) M of aluminum or the like and the product (solid phase) P.
- the current crosses the magnetic lines of force ML, which are generated from the permanent magnet type magnetic field generation device 31 , substantially at right angles to the magnetic lines of force.
- cooling capacity is increased or reduced by the water jacket 23 or the like, the solidification rate of the melt M is changed and the interface IT 0 between the melt (liquid-phase) M and a product (solid-phase) P moves up and down according to this. That is, when cooling capacity is increased, the interface IT 0 moves up like an interface IT 1 as illustrated in FIG. 1( b ). When cooling capacity is reduced, the interface IT 0 moves down like an interface IT 2 as illustrated in FIG. 1( c ). Further, it is preferable that the magnetic field generation device 31 be moved up and down according to the positions of the interfaces IT 0 , IT 1 , and IT 2 in order to efficiently agitate the melt M.
- the magnetic field generation device is adapted so that the height of the magnetic field generation device 31 can be adjusted in the vertical direction according to the heights of these interfaces IT 1 and IT 2 as illustrated in FIGS. 1( b ) and 1 ( c ) and the position of the magnetic field generation device 31 can be kept. Accordingly, it is possible to efficiently agitate the melt M as described above.
- the double structure of the casting mold 2 may be formed so that the inner portion of the casting mold is made of a conductive material and the outer portion thereof is made of a non-conductive material.
- at least the electrodes 32 A may come into electronically contact with the conductive material that forms the inner portion of the casting mold.
- a magnetic field generation device receiving chamber 22 a may be formed in an outer member.
- the casting mold 2 may have not a double structure but a single structure.
- the casting mold 2 may be made of only a conductive material, and the electrodes 32 A may conduct electricity to the casting mold 2 .
- the structure of the other electrode 32 B may be the same as described above.
- the casting mold 2 may be made of only a non-conductive material. In this case, it is necessary to make the electrodes 32 A conduct electricity to the melt M present in the casting mold 2 by making the electrodes 32 A penetrate into the casting mold 2 as illustrated in FIG. 1( a ).
- a magnetic field generation device receiving chamber 22 a may be formed in a member having a single structure.
- a magnetic field generation device 31 A of FIG. 3( b ) may be used instead of magnetic field generation device 31 of FIG. 3( a ).
- the magnetization direction of the magnetic field generation device 31 A of FIG. 3( a ) is opposite to that of the magnetic field generation device 31 of FIG. 3( b ). Both the magnetic field generation devices have the same function.
- magnetic field generation devices 31 - 2 and 31 A- 2 of FIGS. 4( a ) and 4 ( b ) may be used instead of the magnetic field generation devices 31 and 31 A of FIGS. 3( a ) and 3 ( b ).
- the magnetic field generation devices 31 - 2 and 31 A- 2 of FIGS. 4( a ) and 4 ( b ) are adapted so that a plurality of rod-like permanent magnets PM are fixed to the inside of a ring-shaped support (yoke) SP. These have the same function.
- an electrode which includes the roller 32 Ba at the end thereof, has been described as the lower electrode 32 B in the above-mentioned embodiment.
- the lower electrode does not need to necessarily include the roller 32 Ba.
- the electrode 32 B only has to conduct electricity to the product P and may employ various structures.
- an elastic member having a predetermined length is used as the electrode 32 B and is bent, for example, so as to be convex upward or downward in FIG. 1 , and the end of the elastic member comes into press contact with the cast product P by the force of restitution. In this state, the cast product P may be allowed to extend downward.
- melt M that is not yet solidified is agitated to give movement, vibration, and the like to the melt M, so that a degassing effect and the uniformization and refinement of the structure are achieved.
- the magnetic field generation device 31 is adapted so as to be capable of being adjusted in the vertical direction in the embodiment of the invention, it is possible to obtain a high-quality product P by reliably agitating the melt M.
- This is one of the characteristics of the invention as described above, and an idea, in which a magnetic field generation device 31 provided outside the casting mold is moved up and down in a device that is apt to be high temperature and large in size and hardly has an empty space as in the embodiment of the invention, itself is an idea that is not accustomed to those skilled in the art. Accordingly, a technique of the invention, in which a magnetic field generation device is received in a casting mold and can be adjusted in the vertical direction, is a technical idea that is peculiar to the inventor.
- the magnetic field generation device 31 is formed in the embodiment of the invention so that a plurality of magnetic poles are disposed at the positions surrounding the melt M or a ring-shaped magnet surrounding the melt M is disposed, it is possible to efficiently agitate all the melt M with an electromagnetic force that is generated according to Fleming's rule by magnetic lines of force and current. Accordingly, it is possible to obtain a product P as a high-quality product. That is, in the embodiment of the invention, it is possible to efficiently agitate the melt M by making the best use of an electromagnetic force that is generated according to Fleming's rule.
- the axis of the rotation of the melt M which is caused by this agitating of the melt, is an axis parallel to the center axis of the product P in FIG. 1( a ). Accordingly, it is possible to obtain a high-quality product as a product P by making the rotational drive of the melt M reliable.
- melt M is agitated with an electromagnetic force that is generated according to Fleming's rule and is agitated by the cooperation between small current flowing in the melt M and a magnetic field generated from the magnetic field generation device 31 . Accordingly, it is possible to obtain a device that stably and continuously expects reliable agitation unlike melting and agitation performed using the intermittent flow of large current according to the principle of arc welding or the like and has low noise and high durability.
- the electromagnetic agitating device in the related art can cope with a case where several slabs or billets are produced at one time.
- the electromagnetic agitator in the related art cannot cope with this demand.
- the magnetic field generation device is used as the magnetic field generation device in the device of the invention. For this reason, it is possible to make the device very compact in comparison with the electromagnetic agitator that is supplied with large current. Accordingly, it is possible to sufficiently realize a molding device for a mass production facility. Further, since the magnetic field generation device is permanent magnet type, it is possible to obtain a device having effects, such as no heat generation, power saving, energy saving, and less maintenance, as a magnetic field generation device.
- FIG. 5 illustrates another embodiment of the invention.
- This embodiment is different from the embodiment of FIG. 1( a ) in the structure of a casting mold 2 A.
- Other structures are substantially the same as FIG. 1( a ). Accordingly, the detailed description thereof will not be repeated here.
- the casting mold 2 A of this embodiment includes a substantially cylindrical casting mold body 2 A 1 .
- the casting mold body 2 A 1 includes a circumferential groove 2 A 1 ( a ) that is formed on the inner peripheral surface thereof.
- An insulating film 2 A 2 is formed on the inner surface (the peripheral surface and the bottoms) of this groove, and an embedded layer 2 A 3 is formed by embedding the same conductive material as the casting mold body 2 A 1 on the insulating film 2 A 2 .
- An insulating layer portion is formed of the insulating film 2 A 2 and the embedded layer 2 A 3 .
- the insulating layer portion is formed on a part of the inner surface of the casting mold, and functions as a portion that does not allow the flow of current from the casting mold.
- This insulating layer portion is formed on a slightly lower portion of the inner surface of the casting mold body 2 A 1 .
- a terminal 2 A 4 is provided on the outer periphery of the casting mold body 2 A 1 . Power can be supplied to the casting mold 2 A from the power supply 34 through this terminal 2 A 4 .
- FIG. 6 illustrates still another embodiment.
- This embodiment is a modification of the embodiment of FIG. 1( a ).
- This embodiment is different from the embodiment of FIG. 1( a ) in the disposition of the upper electrodes 32 A of FIG. 1( a ). That is, in this embodiment, one electrode 32 A 0 is disposed or a plurality of electrodes 32 A 0 are disposed annularly, these electrodes 32 A 0 are supported by arbitrary units other than the casting mold 2 A and the like (the casting mold 2 A and the water jacket 23 ), and a lower end portion of each of the electrodes 32 A 0 is inserted into the melt M. Accordingly, it is possible to adjust the length of the lower end portion, which is inserted into the melt M, of the electrode 32 A 0 with large degree of freedom regardless of the casting mold 2 A and the like.
- a normal mold may be used as the casting mold 2 A or the like, and electrode insertion holes 2 a for electrodes 32 A 1 do not need to be formed in the casting mold 2 A or the like. Therefore, it is also possible to prevent the increase in the manufacturing costs of these.
- FIG. 1( a ) Other structures are the same as the embodiment of FIG. 1( a ).
- FIG. 7 illustrates yet another embodiment.
- This embodiment may be regarded as a modified example of the embodiment of FIG. 6 .
- FIG. 7 is assumed as a device that can be operated when melt M is poured into a casting mold 2 A, which is provided on the lower side, from a tundish (melt receiving box) 1 A, which is provided on the upper side, as continuous melt with no interruption. That is, it is assumed that the melt M present in the tundish (melt receiving box) 1 A and the melt M present in the casting mold 2 A are integrally connected to each other.
- the electrodes 32 A 0 are inserted into the melt M present in the casting mold 2 .
- an electrode 32 A 1 is supported by arbitrary units so as to be inserted into the melt M present in the tundish (melt receiving box) 1 A on the premise of the above-mentioned case. Accordingly, it is possible to obtain the same advantage as the above-mentioned embodiment of FIG. 6 .
- FIG. 6 Other structures are substantially the same as FIG. 6 .
- FIGS. 8( a ) to 8 ( d ), FIGS. 9( a ) to 9 ( c ), and FIG. 10 illustrate other embodiments of the invention, respectively.
- a water jacket for cooling does not need to be separately provided, a water flow chamber 22 a ( 2 ), which functions as both a cooling chamber and a magnetic field generation device receiving chamber, is formed in the side wall of a casting mold 2 , that is, the side wall of the outer casting mold 22 , and a magnetic field generation device 31 as a permanent magnet is received in the water flow chamber 22 a ( 2 ) so that the position of the magnetic field generation device can be adjusted in the vertical direction.
- a magnetic field generation device receiving space (magnetic field generation device receiving chamber) 22 a ( 2 ) illustrated in FIG. 8( c ) may be divided so as to receive a plurality of permanent magnet pieces 31 A, which are illustrated in FIG. 8( d ) and disposed at a predetermined interval, respectively.
- the magnetic field generation device receiving space may be formed of a plurality of partial magnetic field generation device receiving chambers having an arc-shaped cross-section.
- the outer casting mold 22 includes a water flow chamber 22 a ( 2 ) that is opened downward and has a ring-shaped cross-section, and the water flow chamber 22 a ( 2 ) is hermetically-sealed by a lid 22 B( 1 ).
- FIG. 8( b ) is a view illustrating the inner casting mold 21 and the outer casting mold 22 taken along line VIII(b)-VIII(b) from below when the lid 22 B( 1 ) is removed. This lid 22 B( 1 ) forms a part of the casting mold 2 .
- a magnetic field generation device 31 which is formed of a plurality of permanent magnet pieces 31 A ( FIG. 8( c )) having an arc-shaped cross-section, is received in the ring-shaped water flow chamber 22 a ( 2 ) serving as a magnetic field generation device receiving space (receiving chamber) so as to be capable of being adjusted in the vertical direction. That is, the water flow chamber (cooling chamber) 22 a ( 2 ) functions as both a cooling water flow chamber and a magnetic field generation device receiving chamber.
- FIG. 8( d ) A plan view of these permanent magnet pieces 31 A is illustrated in FIG. 8( d ).
- each of the permanent magnet pieces 31 A is magnetized to an N pole and the outer portion thereof is magnetized to an S pole.
- the magnetization may be contrary to this. That is, the magnetic field generation device 31 is provided so that the height of the magnetic field generation device can be adjusted in the water flow chamber 22 a ( 2 ) by arbitrary units (not illustrated). Accordingly, it is possible to more efficiently agitate the melt M by adjusting the height of the magnetic field generation device so as to correspond to liquid-phase melt M as described above.
- FIG. 8( e ) A plan view of the lid 22 B is illustrated in FIG. 8( e ).
- a plurality of discharge channels 22 B( 1 ) for cooling water are formed in the lid 22 B( 1 ).
- the plurality of discharge channels 22 B( 1 ) include a plurality of inlets 22 B( 1 )a 1 that are opened to the upper surface of the lid 22 B, and include outlets 22 B( 1 )a 2 on the peripheral surface of the lid 22 B.
- cooling water present in the water flow chamber 22 a ( 2 ) enters from the plurality of inlets 22 B( 1 )a 1 , flows out of the outlets 22 B( 1 )a 2 , and is jetted to the outer periphery of the product P to cool the product P. That is, cooling water enters the water flow chamber 22 a ( 2 ) from inlets (not illustrated), is circulated in the water flow chamber while cooling the product, and is discharged while being jetted to the outside from the discharge channels 22 B( 1 ).
- the magnetic field generation device 31 has been formed of the plurality of permanent magnet pieces 31 A in the above-mentioned embodiment of FIGS. 8( a ) to 8 ( e ).
- the magnetic field generation device may be integrally formed as in FIG. 3( a ).
- the water flow chamber 22 a ( 2 ) serving as the magnetic field generation device receiving space is formed in a circumferential shape as understood from FIG. 8( b ).
- the water flow chamber is not limited to this shape, and may be formed of a plurality of cell chambers that are divided in the circumferential direction and have an arc-shaped cross-section. It is preferable that cooling water can flow in each cell chamber and the permanent magnet piece 31 A be received in each cell chamber so as to be capable of moving up and down.
- the magnetic field generation device 31 is not provided outside the casting mold 2 , and a cavity (water flow chamber 22 a ( 2 )) is formed in the casting mold 2 (outer casting mold 22 ) and the magnetic field generation device 31 is received in the cavity. Accordingly, it is possible to obtain the following characteristics.
- the magnetic field generation device 31 is provided outside the casting mold, it is inevitable that a distance between the magnetic field generation device 31 and the melt M is slightly increased. However, since the magnetic field generation device is built in the casting mold 2 in this embodiment, the distance between the magnetic field generation device 31 and the melt M is reduced. Accordingly, a permanent magnet, which is small and has a small capacity, may be used to obtain the same agitating performance.
- the magnetic field generation device 31 is a built-in type, it is possible to provide a device that is small as a whole as much as that.
- the magnetic field generation device 31 is a built-in type when the device is regarded as a device manufacturing the same product P although being the same as described above, the size of the device is reduced as a whole. Accordingly, it is possible to install the device even at a narrow place. As a result, flexibility is obtained in the usefulness of the device.
- the magnetic field generation device 31 be close to the melt M as much as possible in order to reliably apply a magnetic field to the melt M, and this is realized in a built-in type.
- the magnetic field generation device 31 When the magnetic field generation device 31 is provided outside, the influence of a magnetic field on various measuring instruments such as temperature sensors should be considered. However, since the influence thereof is reduced in a built-in type, a built-in type is more advantageous in measurement. That is, when a product P, such as a slab or a billet, is manufactured, the measurement, management, and the like of temperature in several positions are very important to maintain the quality of a product. This embodiment is very advantageous in the measurement of temperature and the like.
- the size, weight, and volume of a device may be reduced when the same magnetic field is applied to the melt M. Accordingly, the device is easy to use. That is, since the respective components of this device are consumables, the respective components of this device need to be replaced whenever a predetermined operation time has passed. However, since the magnetic field generation device 31 is small and light, a work for replacing the magnetic field generation device and the like are very easily performed.
- a work at the device of this embodiment is a work that is performed at a so-called high temperature of about 700° C., the work is very dangerous for a worker.
- a magnetic field generation device which is small and of which the intensity of a magnetic field is low, may be used as the magnetic field generation device 31 .
- a tool which is used for the adjustment, maintenance, and the like of the device, is generally a ferromagnetic body made of iron and safety shoes and the like are also made of iron.
- a magnetic field of the magnetic field generation device 31 which is emitted by the outside, is reduced a little, the safety of a security officer, a worker, a measuring person, and the like is ensured.
- FIGS. 9( a ) to 9 ( c ) illustrate a device for manufacturing a slab.
- the basic technical idea of the device is the same as described above except that a billet has a circular shape and a slab has a rectangular shape. Accordingly, the same members are denoted by the same reference numerals and the description thereof will not be repeated.
- FIGS. 9( b ) and 9 ( c ) A magnetic field generation device 31 is illustrated in FIGS. 9( b ) and 9 ( c ).
- FIG. 9( b ) is a cross-sectional view taken along line IX(b)-IX(b) of FIG. 9( a )
- FIG. 9( c ) is a plan view of the magnetic field generation device 31 .
- the magnetic field generation device 31 uses four permanent magnet pieces 31 A and forms two pairs facing each other, but may use any one pair.
- FIG. 10 illustrates a modified example of FIG. 9( a ).
- a pair of electrodes 32 A and 32 B is used while being inserted into melt M.
- the inventor confirmed by an experiment that the melt M is agitated even though the electrodes 32 A and 32 B are used in this way. That is, even though the pair of electrodes 32 A and 32 B is employed as illustrated in FIG. 10 , the magnetic lines of force generated from a magnetic field generation device 31 and current flowing between the pair of electrodes 32 A and 32 B flow in various paths in the melt M and generate an electromagnetic force according to Fleming's rule.
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Abstract
There is provided a molding device for continuous casting equipped with an agitator that reduces the amount of generated heat, is easy to carry out maintenance, is inexpensive, and is easy to use in practice. The molding device for continuous casting equipped with an agitator of the invention receives liquid-phase melt of a conductive material, and a solid-phase cast product is taken out from the molding device through the cooling of the melt. The molding device includes a casting mold and an agitator provided so as to correspond to the casting mold. The casting mold includes a casting space that includes an inlet and an outlet at a central portion of a substantially cylindrical side wall, and a magnetic field generation device receiving chamber that is formed in the side wall and is positioned outside the casting space. The casting mold receives the liquid-phase melt from the inlet into the casting space and discharges the solid-phase cast product from the outlet through the cooling in the casting space. The agitator includes a magnetic field generation device having an electrode unit that includes first and second electrodes supplying current to at least the liquid-phase melt present in the casting space, and a permanent magnet that applies a magnetic field to the liquid-phase melt. The magnetic field generation device is received in the magnetic field generation device receiving chamber of the casting mold, generates magnetic lines of force toward a center in a lateral direction, makes the magnetic lines of force pass through a part of the side wall of the casting mold and reach the casting space, and applies lateral magnetic lines of force, which cross the current, to the melt.
Description
- The present invention relates to a molding device for continuous casting, which is equipped with an agitator, of continuous casting equipment that produces a billet, a slab or the like made of non-ferrous metal of a conductor (conductive body), such as Al, Cu, Zn, or an alloy of at least two of them, or an Mg alloy, or other metal.
- In the past, a melt agitating method to be described below has been employed in a casting mold for continuous casting. That is, for the improvement of the quality of a slab, a billet, or the like, in a process for solidifying the melt, that is, when the melt passes through the casting mold, a moving magnetic field, which is generated from the outside of the casting mold by an electromagnetic coil, is applied to the melt present in the casting mold so that agitation occurs in the melt not yet solidified. A main object of this agitation is to degas the melt and to uniformize the structure. However, since the electromagnetic coil is disposed at the position close to high-temperature melt, the cooling of the electromagnetic coil and troublesome maintenance are needed and large power consumption is obviously needed. In addition, the generation of heat from the electromagnetic coil itself caused by the power consumption cannot be avoided, and this heat should be removed. For this reason, there are various problems in that the device itself cannot but become expensive, and the like.
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- Patent Literature 1: JP 9-99344 A
- The invention has been made to solve the above-mentioned problems, and an object of the invention is to provide a molding device for continuous casting equipped with an agitator that reduces the amount of generated heat, is easy to carry out maintenance, is inexpensive, and is easy to use in practice.
- A molding device for continuous casting equipped with an agitator according to an embodiment of the present invention is a device which receives liquid-phase melt of a conductive material and from which a solid-phase cast product is taken out through the cooling of the melt. The molding device includes a casting mold including a casting space that includes an inlet and an outlet at a central portion of a substantially cylindrical side wall and a magnetic field generation device receiving chamber that is formed in the side wall and is positioned outside the casting space, the casting mold receiving the liquid-phase melt from the inlet into the casting space and discharging the solid-phase cast product from the outlet through the cooling in the casting space, and an agitator provided so as to correspond to the casting mold, the agitator including a magnetic field generation device having an electrode unit that includes first and second electrodes supplying current to at least the liquid-phase melt present in the casting space, and a permanent magnet that applies a magnetic field to the liquid-phase melt. The magnetic field generation device is received in the magnetic field generation device receiving chamber of the casting mold, generates magnetic lines of force toward a center in a lateral direction, makes the magnetic lines of force pass through a part of the side wall of the casting mold and reach the casting space, and applies lateral magnetic lines of force, which cross the current, to the melt.
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FIG. 1( a) is a view illustrating the entire structure of an embodiment of the invention, andFIGS. 1( b) and 1(c) are explanatory views illustrating the operation thereof. -
FIG. 2( a) is an explanatory plan view taken along line II(a)-II(a) ofFIG. 1 andFIG. 2( b) is an explanatory view illustrating the bottom of an outer casting mold. -
FIG. 3( a) is an explanatory plan view of a magneticfield generation device 31 of anagitator 3, andFIG. 3( b) is an explanatory plan view of a modified example thereof. -
FIG. 4( a) is a plan view of another modified example of the magneticfield generation device 31 of theagitator 3, andFIG. 4( b) is an explanatory plan view of a modified example thereof. -
FIG. 5 is a view illustrating the entire structure of another embodiment of the invention. -
FIG. 6 is a view illustrating the entire structure of another embodiment of the invention. -
FIG. 7 is a view illustrating the entire structure of still another embodiment of the invention. -
FIG. 8( a) is a view illustrating the entire structure of yet another embodiment of the invention,FIG. 8( b) is a cross-sectional view taken along line VIII(b)-VIII(b) ofFIG. 8( a),FIG. 8( c) is a cross-sectional view taken along line VIII(c)-VIII(c) ofFIG. 8( a),FIG. 8( d) is an explanatory plan view of a magnetic field generation device, andFIG. 8( e) is an explanatory plan view of a lid. -
FIG. 9( a) is a view illustrating the entire structure of still another embodiment of the invention,FIG. 9( b) is a cross-sectional view taken along line IX(b)-IX(b) ofFIG. 9( a), andFIG. 9( c) is an explanatory plan view of a magnetic field generation device. -
FIG. 10 is a view illustrating the entire structure of yet another embodiment of the invention. - For deeper understanding of an embodiment of the invention, an electromagnetic agitator, which uses electricity as power, of continuous casting equipment in the related art will be described briefly.
- In the related art, a fixed amount of melt M of non-ferrous metal is discharged from a melt receiving box that is called a tundish and is poured into a casting mold that is provided on the lower side. Cooling water for cooling the casting mold is circulated in the casting mold. Accordingly, high-temperature melt starts to solidify from the outer periphery thereof (a portion thereof close to the casting mold) from the moment that the high-temperature melt comes into contact with the casting mold.
- Since the melt, which is positioned at the central portion of the casting mold, is distant from the wall of the casting mold that is being cooled, the solidification of the melt positioned at the central portion of the casting mold is obviously later than that of the melt positioned at the peripheral portion of the casting mold. For this reason, two kinds of melt, that is, liquid (liquid-phase) melt and a solid (solid-phase) cast product are simultaneously present in the casting mold while being adjacent to each other with an interface interposed therebetween. Further, generally, if melt is solidified too rapidly, gas remains in the cast product (product) having been changed into a solid and causes the quality of the product to deteriorate. For this reason, degassing is facilitated by the agitating of the melt that is not yet solidified. The electromagnetic agitator, which uses electricity as power, has been used for the agitating in the related art.
- However, when such an electromagnetic agitator is used, there are various difficulties as described above.
- Accordingly, the invention is to provide a molding device for continuous casting equipped with an agitator that does not use the electromagnetic agitator using electricity as power and uses permanent magnets.
- An embodiment of the invention will be described in more detail below.
- The entire structure of an embodiment of the invention is illustrated in
FIG. 1( a).FIG. 2( a) is an explanatory plan view taken along line II(a)-II(a) ofFIG. 1( a), and mainly illustrates a part of anagitator 3 and acasting mold 2, andFIG. 3( a) is an explanatory plan view of the magneticfield generation device 31 of theagitator 3. - As understood from
FIG. 1( a), a device according to an embodiment of the invention broadly includes amelt supply unit 1 that supplies melt M of non-ferrous metal of a conductor (conductive body), such as Al, Cu, Zn, or an alloy of at least two of them, or an Mg alloy, or other metal; acasting mold 2 that receives the melt from themelt supply unit 1; and anagitator 3 that agitates the melt M present in thecasting mold 2. A central portion of thecasting mold 2 forms a so-calledcasting space 2A(1) that includes aninlet 2A(1)1 and anoutlet 2A(1)2. - The
melt supply unit 1 includes a tundish (melt receiving box) 1A that receives melt M from a ladle (not illustrated) or the like. The melt M is stored in the tundish (melt receiving box) 1A, inclusion is removed from the melt, and the melt M is supplied to thecasting mold 2 from alower opening 1B of the tundish at a constant supply rate. Only the tundish (melt receiving box) 1A is illustrated inFIG. 1 . - The
casting mold 2 is adapted in this embodiment so that a columnar product P (billet) is taken out from the casting mold. For this purpose, thecasting mold 2 is formed so as to have a substantially cylindrical double structure (of which the cross-section has a ring shape). That is, thecasting mold 2 includes aninner casting mold 21 and anouter casting mold 22 that are fitted to each other. Theinner casting mold 21 is provided on the inside and made of a non-conductive material (non-conductive refractory material) such as graphite (carbon). Theouter casting mold 22 is provided on the outside and made of a conductive material (conductive refractory material), such as aluminum or copper. - As described in detail below, the magnetic
field generation device 31 is assembled so as to be received within the side wall of theouter casting mold 22. Meanwhile, since the technical idea is the same as described above even when a prismatic product (slab) is taken out, the technical idea of an embodiment to be described below can be applied as it is. Briefly, the shapes of components corresponding to a rectangular slab, which is a product, are merely changed. - The
casting mold 2 further includes awater jacket 23 outside theouter casting mold 22. - The
water jacket 23 is to cool the melt M that flows into theinner casting mold 21. That is, cooling water flows into thewater jacket 23 from an inlet (not illustrated) and is circulated in thewater jacket 23, the outer portion of theouter casting mold 22 is cooled by the cooling water, and the cooling water is discharged from an outlet (not illustrated). The melt M is rapidly cooled by thewater jacket 23. Since water jackets having various known structures may be employed as thewater jacket 23, the detailed description thereof will not be provided here. - In addition, a plurality of
electrode insertion holes electrodes 32A to be described below are inserted are formed at a predetermined interval on the circumference of thecasting mold 2 having the above-mentioned structure. Theelectrode insertion holes 2 a are formed so as to be inclined downward toward the center of thecasting mold 2. For this reason, if the surface of the melt M is lower than the upper openings of theelectrode insertion holes 2 a even though the melt M is contained in thecasting mold 2, there is no concern that the melt M will leak to the outside. - As described above, briefly, the
agitator 3 is provided so as to be built in the side wall of thecasting mold 2. Theagitator 3 includes a permanent magnet type magneticfield generation device 31, and a pair of upper and lower electrodes (positive and negative electrodes) 32A and 32B. - In particular, as understood from
FIG. 3( a), the magneticfield generation device 31 is formed in the shape of a ring (in a frame shape). The entire inner peripheral portion of the magnetic field generation device may be magnetized to an N pole, and the entire outer peripheral portion of the magnetic field generation device may be magnetized to an S pole. Further, four portions of the inner and outer peripheral portions may be partially magnetized to an N pole and an S pole as illustrated in, for example,FIG. 3( a), respectively. - As understood from the following description, the magnetic
field generation device 31 does not necessarily need to be formed in the shape of a ring, and may be divided. That is, for example, as illustrated inFIG. 8( d), the cross-section of the magnetic field generation device may be formed of a plurality of arc-shaped permanent magnet pieces (FIG. 4) . As briefly described above, particularly, as understood fromFIG. 1( a), the magneticfield generation device 31 is assembled in theouter casting mold 22. - In more detail, as understood from
FIG. 1( a), theouter casting mold 22 includes a magnetic field generationdevice receiving chamber 22 a which is formed in the side wall thereof and has a ring-shaped cross-section and of which a lower portion forms a release port. The magnetic field generationdevice receiving chamber 22 a is also understood fromFIG. 2( b).FIG. 2( b) is a view of theouter casting mold 22 when theouter casting mold 22 is seen from below. In particular, as understood fromFIG. 1( a), the magneticfield generation device 31 also having a ring-shaped cross-section is received in the magnetic field generationdevice receiving chamber 22 a, which has a ring-shaped cross-section and of which the lower portion is opened, from below so that the position of the magnetic field generation device in the vertical direction can be adjusted by movement. That is, the magneticfield generation device 31 is provided so that the height of the magnetic field generation device can be adjusted in the magnetic field generationdevice receiving chamber 22 a by desired units (not illustrated). Accordingly, it is possible to more efficiently agitate the melt M as described below by adjusting the height of the magnetic field generation device so as to correspond to liquid-phase melt M as understood fromFIG. 1( a). The lower opening of the magnetic field generationdevice receiving chamber 22 a is closed by a ring-shapedlid 22B. Thelid 22B may be formed so as to includedischarge channels 22B (1) for discharging cooling water to the outside such as alid 22B ofFIG. 8( a) to be described below. - As described above, the four portions of the magnetic
field generation device 31 are magnetized and form pairs ofmagnetic poles FIG. 3( a). That is, a portion of each of themagnetic poles mold 2. - The magnetization may be contrary to this. That is, the inner portions of all magnetic poles may be magnetized to a certain pole and the outer portions thereof may be magnetized to an opposite pole. One of additional characteristics of the invention is that a plurality of magnetic poles are disposed at a plurality of positions surrounding the melt M, which is not yet solidified, as understood from
FIG. 3( a). Accordingly, it is possible to improve the quality of the product P by agitating all the melt M with an electromagnetic force that is generated according to Fleming's rule by magnetic lines of force and current as described below. Therefore, the number of the magnetic poles is four inFIG. 3( a), but is not limited to four and may be arbitrary. Further, as described above, the magneticfield generation device 31 does not need to be formed of a ring-shaped single body, and may be divided into a plurality of magnet bodies (magnet pieces), of which the number is arbitrary, as illustrated inFIG. 8( d). - In
FIG. 1( a), current flows between the pair ofelectrodes electrode 32A may be used, but a plurality ofelectrodes 32A may be used. In this embodiment, twoelectrodes 32A are used. Theelectrodes 32A are formed in the shape of a probe. - The
respective electrodes 32A are inserted into the above-mentionedelectrode insertion holes 2 a. That is, theelectrodes 32A penetrate into the casting mold 2 (theinner casting mold 21 and the outer casting mold 22) from thewater jacket 23. Inner ends of theelectrodes 32A are exposed to the inside of theinner casting mold 21, come into contact with the melt M, and conduct electricity to the melt M. Outer ends of theelectrodes 32A are exposed to the outside of thewater jacket 23. The outer ends are connected to apower supply 34 that can supply variable direct current. Thepower supply 34 may have the function of an AC power supply as described below, and may have a function of changing frequency. Theelectrodes 32A may be supported above the upper opening of the castingmold 2 without penetrating the side wall of the castingmold 2 so that the inner ends of theelectrodes 32A are inserted into the melt M from the surface of the melt M flowing into the castingmold 2. Theelectrodes 32A may be electrically connected to theinner casting mold 21 made of graphite or the like. - The number of electrodes used as the
electrodes 32A may be arbitrary, and an arbitrary number of theelectrodes 32A may be inserted into arbitrary electrode insertion holes of theelectrode insertion holes - In
FIG. 1( a), thelower electrode 32B is provided so that the position of thelower electrode 32B is fixed. Theelectrode 32B is formed of a roller type electrode. That is, thelower electrode 32B includes a rotatable roller 32Ba at the end thereof. The roller 32Ba comes into press contact with the outer surface of a columnar product P as a cast product (a billet or a slab) that is extruded in a solid phase state. Accordingly, as the product P extends downward, the roller 32Ba is rotated. That is, when the product P is extruded downward, the product P extends downward inFIG. 1 while coming into contact with the roller 32Ba and rotating the roller 32Ba. - Accordingly, when a voltage is applied between the pair of
electrodes power supply 34, current flows between the pair ofelectrodes power supply 34 is adapted so as to be capable of controlling the amount of current flowing between the pair ofelectrodes - Next, the operation of the device having the above-mentioned structure will be described.
- In
FIG. 1( a), a fixed amount of the melt M, which is discharged from the tundish (melt receiving box) 1A, is input to the upper portion of the castingmold 2. The castingmold 2 is cooled through the circulation of water in thewater jacket 23, so that the melt M present in the castingmold 2 is rapidly cooled and solidified. However, the melt M present in the castingmold 2 has a two-phase structure where the upper portion of the melt is liquid (liquid phase), the lower portion thereof is solid (solid phase), and the upper and lower portions of the melt are adjacent to each other at an interface IT0. When passing through the castingmold 2, the melt M is formed in the shape (a columnar shape in this embodiment) corresponding to the shape of the casting mold. Accordingly, a product P as a slab or billet is continuously formed. - Further, since the permanent magnet type magnetic
field generation device 31 is received in the side wall of the castingmold 2 as understood fromFIG. 1( a) and the like, the magnetic field (magnetic lines of force ML) of the magnetic field generation device reaches the melt M, which is present in the castingmold 2, in the lateral direction. In this state, when direct current is supplied to thelower electrode 32B from theupper electrodes 32A by thepower supply 34, the current flows to thelower electrode 32B from theupper electrodes 32A through the melt (liquid phase) M of aluminum or the like and the product (solid phase) P. At this time, the current crosses the magnetic lines of force ML, which are generated from the permanent magnet type magneticfield generation device 31, substantially at right angles to the magnetic lines of force. Accordingly, rotation occurs in the liquid-phase melt M in accordance with Fleming's left-hand rule. The melt M is agitated in this way, so that impurities, gas, and the like contained in the melt M float and so-called degassing is actively performed. Accordingly, the quality of the product (a slab or a billet) P is improved. - Now, cooling capacity is increased or reduced by the
water jacket 23 or the like, the solidification rate of the melt M is changed and the interface IT0 between the melt (liquid-phase) M and a product (solid-phase) P moves up and down according to this. That is, when cooling capacity is increased, the interface IT0 moves up like an interface IT1 as illustrated inFIG. 1( b). When cooling capacity is reduced, the interface IT0 moves down like an interface IT2 as illustrated inFIG. 1( c). Further, it is preferable that the magneticfield generation device 31 be moved up and down according to the positions of the interfaces IT0, IT1, and IT2 in order to efficiently agitate the melt M. Accordingly, it is possible to obtain a product P as a high-quality product by reliably and efficiently agitating the melt M. For this purpose, the magnetic field generation device is adapted so that the height of the magneticfield generation device 31 can be adjusted in the vertical direction according to the heights of these interfaces IT1 and IT2 as illustrated inFIGS. 1( b) and 1(c) and the position of the magneticfield generation device 31 can be kept. Accordingly, it is possible to efficiently agitate the melt M as described above. - On the contrary, the double structure of the casting
mold 2 may be formed so that the inner portion of the casting mold is made of a conductive material and the outer portion thereof is made of a non-conductive material. In this case, at least theelectrodes 32A may come into electronically contact with the conductive material that forms the inner portion of the casting mold. Even in this case, a magnetic field generationdevice receiving chamber 22 a may be formed in an outer member. - Further, the casting
mold 2 may have not a double structure but a single structure. In this case, the castingmold 2 may be made of only a conductive material, and theelectrodes 32A may conduct electricity to the castingmold 2. The structure of theother electrode 32B may be the same as described above. - On the contrary, the casting
mold 2 may be made of only a non-conductive material. In this case, it is necessary to make theelectrodes 32A conduct electricity to the melt M present in the castingmold 2 by making theelectrodes 32A penetrate into the castingmold 2 as illustrated inFIG. 1( a). - In these cases, obviously, a magnetic field generation
device receiving chamber 22 a may be formed in a member having a single structure. - A magnetic
field generation device 31A ofFIG. 3( b) may be used instead of magneticfield generation device 31 ofFIG. 3( a). The magnetization direction of the magneticfield generation device 31A ofFIG. 3( a) is opposite to that of the magneticfield generation device 31 ofFIG. 3( b). Both the magnetic field generation devices have the same function. - Further, magnetic field generation devices 31-2 and 31A-2 of
FIGS. 4( a) and 4(b) may be used instead of the magneticfield generation devices FIGS. 3( a) and 3(b). The magnetic field generation devices 31-2 and 31A-2 ofFIGS. 4( a) and 4(b) are adapted so that a plurality of rod-like permanent magnets PM are fixed to the inside of a ring-shaped support (yoke) SP. These have the same function. - Furthermore, an electrode, which includes the roller 32Ba at the end thereof, has been described as the
lower electrode 32B in the above-mentioned embodiment. However, the lower electrode does not need to necessarily include the roller 32Ba. Even though a product P is continuously extruded, theelectrode 32B only has to conduct electricity to the product P and may employ various structures. For example, an elastic member having a predetermined length is used as theelectrode 32B and is bent, for example, so as to be convex upward or downward inFIG. 1 , and the end of the elastic member comes into press contact with the cast product P by the force of restitution. In this state, the cast product P may be allowed to extend downward. - According to the above-mentioned embodiment of the invention, it is possible to obtain the following effects.
- In the embodiment of the invention, melt M that is not yet solidified is agitated to give movement, vibration, and the like to the melt M, so that a degassing effect and the uniformization and refinement of the structure are achieved.
- In more detail, since the magnetic
field generation device 31 is adapted so as to be capable of being adjusted in the vertical direction in the embodiment of the invention, it is possible to obtain a high-quality product P by reliably agitating the melt M. This is one of the characteristics of the invention as described above, and an idea, in which a magneticfield generation device 31 provided outside the casting mold is moved up and down in a device that is apt to be high temperature and large in size and hardly has an empty space as in the embodiment of the invention, itself is an idea that is not accustomed to those skilled in the art. Accordingly, a technique of the invention, in which a magnetic field generation device is received in a casting mold and can be adjusted in the vertical direction, is a technical idea that is peculiar to the inventor. - Further, since the magnetic
field generation device 31 is formed in the embodiment of the invention so that a plurality of magnetic poles are disposed at the positions surrounding the melt M or a ring-shaped magnet surrounding the melt M is disposed, it is possible to efficiently agitate all the melt M with an electromagnetic force that is generated according to Fleming's rule by magnetic lines of force and current. Accordingly, it is possible to obtain a product P as a high-quality product. That is, in the embodiment of the invention, it is possible to efficiently agitate the melt M by making the best use of an electromagnetic force that is generated according to Fleming's rule. In addition, the axis of the rotation of the melt M, which is caused by this agitating of the melt, is an axis parallel to the center axis of the product P inFIG. 1( a). Accordingly, it is possible to obtain a high-quality product as a product P by making the rotational drive of the melt M reliable. - Moreover, in the embodiment of the invention, melt M is agitated with an electromagnetic force that is generated according to Fleming's rule and is agitated by the cooperation between small current flowing in the melt M and a magnetic field generated from the magnetic
field generation device 31. Accordingly, it is possible to obtain a device that stably and continuously expects reliable agitation unlike melting and agitation performed using the intermittent flow of large current according to the principle of arc welding or the like and has low noise and high durability. - It is obvious that the above-mentioned effects are obtained from all embodiments to be described below.
- Meanwhile, direct current has been supplied between the
electrodes power supply 34. In this case, the melt M does not rotate but repeatedly vibrates according to the cycle thereof in the relationship with a magnetic field that is generated from the magneticfield generation device 31. Impurities are removed from the melt M even by the vibration. This modified example may be applied to all embodiments to be described below. In this case, it is obvious that a power supply having a function of changing frequency is employed as thepower supply 34. - Further, the realization of mass production facilities is currently required in the industry. It is essential to realize a casting mold that is as small as possible when mass production is considered.
- Here, the electromagnetic agitating device in the related art can cope with a case where several slabs or billets are produced at one time. However, at present, there is a demand for the production of billets of which the number exceeds 100. The electromagnetic agitator in the related art cannot cope with this demand.
- However, permanent magnets are used as the magnetic field generation device in the device of the invention. For this reason, it is possible to make the device very compact in comparison with the electromagnetic agitator that is supplied with large current. Accordingly, it is possible to sufficiently realize a molding device for a mass production facility. Further, since the magnetic field generation device is permanent magnet type, it is possible to obtain a device having effects, such as no heat generation, power saving, energy saving, and less maintenance, as a magnetic field generation device.
-
FIG. 5 illustrates another embodiment of the invention. - More current is supplied to this liquid-phase melt M to generate a larger electromagnetic force so that the melt M is rotationally driven.
- This embodiment is different from the embodiment of
FIG. 1( a) in the structure of a castingmold 2A. Other structures are substantially the same asFIG. 1( a). Accordingly, the detailed description thereof will not be repeated here. - That is, the casting
mold 2A of this embodiment includes a substantially cylindrical casting mold body 2A1. The casting mold body 2A1 includes a circumferential groove 2A1(a) that is formed on the inner peripheral surface thereof. An insulating film 2A2 is formed on the inner surface (the peripheral surface and the bottoms) of this groove, and an embedded layer 2A3 is formed by embedding the same conductive material as the casting mold body 2A1 on the insulating film 2A2. An insulating layer portion is formed of the insulating film 2A2 and the embedded layer 2A3. The insulating layer portion is formed on a part of the inner surface of the casting mold, and functions as a portion that does not allow the flow of current from the casting mold. - This insulating layer portion is formed on a slightly lower portion of the inner surface of the casting mold body 2A1.
- Accordingly, current is hardly allowed to flow to the cast product P from the insulating layer portion of the casting mold body 2A1, that is, a portion adjacent to the cast product P.
- In addition, a terminal 2A4 is provided on the outer periphery of the casting mold body 2A1. Power can be supplied to the casting
mold 2A from thepower supply 34 through this terminal 2A4. - When a voltage is applied between the terminal 2A4 and the
electrode 32B by thepower supply 34 in the device having this structure, current flows in the casting mold body 2A1, the melt M, and the cast product P. Since current does not flow in the insulating film 2A2 and the embedded layer 2A3 at this time, larger current flows in the melt M. Accordingly, a larger electromagnetic force, which allows the melt M to be agitated, is obtained. -
FIG. 6 illustrates still another embodiment. - This embodiment is a modification of the embodiment of
FIG. 1( a). - This embodiment is different from the embodiment of
FIG. 1( a) in the disposition of theupper electrodes 32A ofFIG. 1( a). That is, in this embodiment, one electrode 32A0 is disposed or a plurality of electrodes 32A0 are disposed annularly, these electrodes 32A0 are supported by arbitrary units other than the castingmold 2A and the like (the castingmold 2A and the water jacket 23), and a lower end portion of each of the electrodes 32A0 is inserted into the melt M. Accordingly, it is possible to adjust the length of the lower end portion, which is inserted into the melt M, of the electrode 32A0 with large degree of freedom regardless of the castingmold 2A and the like. Moreover, obviously, a normal mold may be used as the castingmold 2A or the like, andelectrode insertion holes 2 a for electrodes 32A1 do not need to be formed in the castingmold 2A or the like. Therefore, it is also possible to prevent the increase in the manufacturing costs of these. - Other structures are the same as the embodiment of
FIG. 1( a). -
FIG. 7 illustrates yet another embodiment. - This embodiment may be regarded as a modified example of the embodiment of
FIG. 6 . - The embodiment of
FIG. 7 is assumed as a device that can be operated when melt M is poured into a castingmold 2A, which is provided on the lower side, from a tundish (melt receiving box) 1A, which is provided on the upper side, as continuous melt with no interruption. That is, it is assumed that the melt M present in the tundish (melt receiving box) 1A and the melt M present in the castingmold 2A are integrally connected to each other. - In
FIG. 6 , the electrodes 32A0 are inserted into the melt M present in the castingmold 2. However, inFIG. 7 , an electrode 32A1 is supported by arbitrary units so as to be inserted into the melt M present in the tundish (melt receiving box) 1A on the premise of the above-mentioned case. Accordingly, it is possible to obtain the same advantage as the above-mentioned embodiment ofFIG. 6 . In addition, it is possible to set and adjust a distance between the tundish (melt receiving box) 1A and the castingmold 2A or the like regardless of the electrode 32A1. - Other structures are substantially the same as
FIG. 6 . -
FIGS. 8( a) to 8(d),FIGS. 9( a) to 9(c), andFIG. 10 illustrate other embodiments of the invention, respectively. - The same members of these embodiments as the members of the above-mentioned embodiment are denoted by the same reference numerals and the description thereof will not be repeated.
- In these embodiments, a water jacket for cooling does not need to be separately provided, a
water flow chamber 22 a(2), which functions as both a cooling chamber and a magnetic field generation device receiving chamber, is formed in the side wall of a castingmold 2, that is, the side wall of theouter casting mold 22, and a magneticfield generation device 31 as a permanent magnet is received in thewater flow chamber 22 a(2) so that the position of the magnetic field generation device can be adjusted in the vertical direction. - Meanwhile, a magnetic field generation device receiving space (magnetic field generation device receiving chamber) 22 a(2) illustrated in
FIG. 8( c) may be divided so as to receive a plurality ofpermanent magnet pieces 31A, which are illustrated inFIG. 8( d) and disposed at a predetermined interval, respectively. For example, the magnetic field generation device receiving space may be formed of a plurality of partial magnetic field generation device receiving chambers having an arc-shaped cross-section. - First, a device of manufacturing a billet of the embodiment illustrated in
FIGS. 8( a) to 8(e) will be described. - That is, as understood from
FIG. 8( a), theouter casting mold 22 includes awater flow chamber 22 a(2) that is opened downward and has a ring-shaped cross-section, and thewater flow chamber 22 a(2) is hermetically-sealed by alid 22B(1).FIG. 8( b) is a view illustrating theinner casting mold 21 and theouter casting mold 22 taken along line VIII(b)-VIII(b) from below when thelid 22B(1) is removed. Thislid 22B(1) forms a part of the castingmold 2. - As understood from
FIG. 8( a), a magneticfield generation device 31, which is formed of a plurality ofpermanent magnet pieces 31A (FIG. 8( c)) having an arc-shaped cross-section, is received in the ring-shapedwater flow chamber 22 a(2) serving as a magnetic field generation device receiving space (receiving chamber) so as to be capable of being adjusted in the vertical direction. That is, the water flow chamber (cooling chamber) 22 a(2) functions as both a cooling water flow chamber and a magnetic field generation device receiving chamber. A plan view of thesepermanent magnet pieces 31A is illustrated inFIG. 8( d). The inner portion of each of thepermanent magnet pieces 31A is magnetized to an N pole and the outer portion thereof is magnetized to an S pole. The magnetization may be contrary to this. That is, the magneticfield generation device 31 is provided so that the height of the magnetic field generation device can be adjusted in thewater flow chamber 22 a(2) by arbitrary units (not illustrated). Accordingly, it is possible to more efficiently agitate the melt M by adjusting the height of the magnetic field generation device so as to correspond to liquid-phase melt M as described above. - The lower opening of the
water flow chamber 22 a(2) is closed by the above-mentioned ring-shapedlid 22B. A plan view of thelid 22B is illustrated inFIG. 8( e). As understood fromFIGS. 8( e) and 8(a), a plurality ofdischarge channels 22B(1) for cooling water are formed in thelid 22B(1). As understood fromFIGS. 8( a) and 8(e), the plurality ofdischarge channels 22B(1) include a plurality ofinlets 22B(1)a1 that are opened to the upper surface of thelid 22B, and includeoutlets 22B(1)a2 on the peripheral surface of thelid 22B. Accordingly, cooling water present in thewater flow chamber 22 a(2) enters from the plurality ofinlets 22B(1)a1, flows out of theoutlets 22B(1)a2, and is jetted to the outer periphery of the product P to cool the product P. That is, cooling water enters thewater flow chamber 22 a(2) from inlets (not illustrated), is circulated in the water flow chamber while cooling the product, and is discharged while being jetted to the outside from thedischarge channels 22B(1). - Since the operation of the above-mentioned device of
FIGS. 8( a) to 8(e) is the same as that of the above-mentioned embodiment, the description thereof will not be repeated. - Meanwhile, the magnetic
field generation device 31 has been formed of the plurality ofpermanent magnet pieces 31A in the above-mentioned embodiment ofFIGS. 8( a) to 8(e). However, it is obvious that the magnetic field generation device may be integrally formed as inFIG. 3( a). Further, thewater flow chamber 22 a(2) serving as the magnetic field generation device receiving space is formed in a circumferential shape as understood fromFIG. 8( b). However, the water flow chamber is not limited to this shape, and may be formed of a plurality of cell chambers that are divided in the circumferential direction and have an arc-shaped cross-section. It is preferable that cooling water can flow in each cell chamber and thepermanent magnet piece 31A be received in each cell chamber so as to be capable of moving up and down. - In the device of
FIGS. 8( a) to 8(e), the magneticfield generation device 31 is not provided outside the castingmold 2, and a cavity (water flow chamber 22 a(2)) is formed in the casting mold 2 (outer casting mold 22) and the magneticfield generation device 31 is received in the cavity. Accordingly, it is possible to obtain the following characteristics. -
- A permanent magnet, which is small and has a small capacity, may be used as the magnetic
field generation device 31.
- A permanent magnet, which is small and has a small capacity, may be used as the magnetic
- That is, if the magnetic
field generation device 31 is provided outside the casting mold, it is inevitable that a distance between the magneticfield generation device 31 and the melt M is slightly increased. However, since the magnetic field generation device is built in the castingmold 2 in this embodiment, the distance between the magneticfield generation device 31 and the melt M is reduced. Accordingly, a permanent magnet, which is small and has a small capacity, may be used to obtain the same agitating performance. -
- It is possible to significantly improve a working property.
- That is, when this device is operated, a plurality of inspectors should be positioned around the device to perform various kinds of measurement, nondestructive inspection, and the like and should perform such the measurement and the like for the check of a product P. However, in the case of the magnetic field generation device that is provided outside, the increase in size and volume cannot be avoided and it cannot be denied that it is difficult to perform such the measurement since a strong magnetic field is generated. However, since the magnetic
field generation device 31 is provided in the castingmold 2 in this embodiment, a volume is not increased and the intensity of a magnetic field emitted to the outside is reduced. For this reason, it is easy to perform various kinds of measurement and the like. -
- It is possible to significantly improve productivity.
- That is, it is possible to reduce time required for the above-mentioned measurement and the like. As a result, it is possible to increase the manufacturing rate of a product P per unit time.
-
- It is possible to reduce size.
- That is, since the magnetic
field generation device 31 is a built-in type, it is possible to provide a device that is small as a whole as much as that. -
- It is possible to save a space of an installation location.
- That is, since the magnetic
field generation device 31 is a built-in type when the device is regarded as a device manufacturing the same product P although being the same as described above, the size of the device is reduced as a whole. Accordingly, it is possible to install the device even at a narrow place. As a result, flexibility is obtained in the usefulness of the device. - The above-mentioned effects will be described below from a different standpoint.
- When a product P is manufactured by this device, for example, five or six workers gather around the device and should perform high-density works (works for monitoring and preventing the leakage of melt, works for monitoring and preventing the jet of melt, and the like) in a short time. When these works are performed by a plurality of workers, a working property is good in the built-in type device of this embodiment as compared to a case where the magnetic
field generation device 31 is provided outside so as to protrude. That is, since the external appearance of the device has the same dimensions as the dimensions of a device that does not include the magneticfield generation device 31 that is a device in the related art, the device of this embodiment is very easy to use at the work site. - Further, it is preferable that the magnetic
field generation device 31 be close to the melt M as much as possible in order to reliably apply a magnetic field to the melt M, and this is realized in a built-in type. - When the magnetic
field generation device 31 is provided outside, the influence of a magnetic field on various measuring instruments such as temperature sensors should be considered. However, since the influence thereof is reduced in a built-in type, a built-in type is more advantageous in measurement. That is, when a product P, such as a slab or a billet, is manufactured, the measurement, management, and the like of temperature in several positions are very important to maintain the quality of a product. This embodiment is very advantageous in the measurement of temperature and the like. - If a built-in type magnetic field generation device as in this embodiment is used instead of the magnetic field generation device provided outside, the size, weight, and volume of a device may be reduced when the same magnetic field is applied to the melt M. Accordingly, the device is easy to use. That is, since the respective components of this device are consumables, the respective components of this device need to be replaced whenever a predetermined operation time has passed. However, since the magnetic
field generation device 31 is small and light, a work for replacing the magnetic field generation device and the like are very easily performed. - Since a work at the device of this embodiment is a work that is performed at a so-called high temperature of about 700° C., the work is very dangerous for a worker. However, a magnetic field generation device, which is small and of which the intensity of a magnetic field is low, may be used as the magnetic
field generation device 31. Further, a tool, which is used for the adjustment, maintenance, and the like of the device, is generally a ferromagnetic body made of iron and safety shoes and the like are also made of iron. However, if a magnetic field of the magneticfield generation device 31, which is emitted by the outside, is reduced a little, the safety of a security officer, a worker, a measuring person, and the like is ensured. - It is obvious that the effects described above with reference to
FIGS. 8( a) to 8(e) are mentioned in not only the device ofFIG. 1 and the like but also devices for manufacturing a slab that are to be described below and illustrated inFIGS. 9( a) to 9(c) and 10. -
FIGS. 9( a) to 9(c) illustrate a device for manufacturing a slab. However, the basic technical idea of the device is the same as described above except that a billet has a circular shape and a slab has a rectangular shape. Accordingly, the same members are denoted by the same reference numerals and the description thereof will not be repeated. - A difference will be described below.
- The weight of a slab as a product P is very heavy. For this reason, a billet can be pulled in the horizontal direction, but a slab as a product P is not obtained unless taken out in the vertical direction. For this reason, a
pedestal 51 is prepared, and a product P is taken out while riding thepedestal 51 and being gradually pulled downward. Alower electrode 32B is embedded in thepedestal 51. A magneticfield generation device 31 is illustrated inFIGS. 9( b) and 9(c).FIG. 9( b) is a cross-sectional view taken along line IX(b)-IX(b) ofFIG. 9( a), andFIG. 9( c) is a plan view of the magneticfield generation device 31. Here, the magneticfield generation device 31 uses fourpermanent magnet pieces 31A and forms two pairs facing each other, but may use any one pair. -
FIG. 10 illustrates a modified example ofFIG. 9( a). - In
FIG. 10 , a pair ofelectrodes electrodes electrodes FIG. 10 , the magnetic lines of force generated from a magneticfield generation device 31 and current flowing between the pair ofelectrodes
Claims (20)
1. A molding device for continuous casting equipped with an agitator which receives liquid-phase melt of a conductive material and from which a solid-phase cast product is taken out through the cooling of the melt, the molding device comprising:
a casting mold including a casting space that includes an inlet and an outlet at a central portion of a substantially cylindrical side wall and a magnetic field generation device receiving chamber that is formed in the side wall and is positioned outside the casting space, the casting mold receiving the liquid-phase melt from the inlet into the casting space and discharging the solid-phase cast product from the outlet through the cooling in the casting space; and
an agitator provided so as to correspond to the casting mold, the agitator including a magnetic field generation device having an electrode unit that includes first and second electrodes supplying current to at least the liquid-phase melt present in the casting space, and a permanent magnet that applies a magnetic field to the liquid-phase melt,
wherein the magnetic field generation device is received in the magnetic field generation device receiving chamber of the casting mold, generates magnetic lines of force toward a center in a lateral direction, makes the magnetic lines of force pass through a part of the side wall of the casting mold and reach the casting space, and applies lateral magnetic lines of force, which cross the current, to the melt.
2. The molding device according to claim 1 ,
wherein the magnetic field generation device receiving chamber is formed in a side wall of the casting mold at the outer peripheral position of the casting space.
3. The molding device according to claim 1 ,
wherein the magnetic field generation device receiving chamber includes an opening that is formed in the side wall of the casting mold so as to be opened downward.
4. The molding device according to claim 1 ,
wherein a cooling unit is provided outside the casting mold.
5. The molding device according to claim 1 ,
wherein the opening of the magnetic field generation device receiving chamber is closed by a lid, and the magnetic field generation device receiving chamber functions as a cooling chamber that allows the flow of cooling water.
6. The molding device according to claim 1 ,
wherein the magnetic field generation device is provided in the magnetic field generation device receiving chamber so that the position of the magnetic field generation device is adjustable in a vertical direction according to the position of an interface between liquid-phase melt and a solid-phase product present in the casting space.
7. The molding device according to claim 1 ,
wherein discharge channels through which cooling water flowing in the magnetic field generation device receiving chamber is jetted to the product are formed in the casting mold.
8. The molding device according to claim 1 ,
wherein the cross-section of the magnetic field generation device receiving chamber is formed in a frame shape so that the magnetic field generation device receiving chamber surrounds the entire periphery of the casting space.
9. The molding device according to claim 1 ,
wherein the magnetic field generation device receiving chamber is formed of a plurality of partial magnetic field generation device receiving chambers that are divided and independent, and each of the partial magnetic field generation device receiving chambers is formed so as to surround a part of the entire periphery of the casting space.
10. The molding device according to claim 8 ,
wherein the cross-section of the magnetic field generation device is formed in a frame shape, the inner peripheral portion of the magnetic field generation device is magnetized to a first pole, and the outer peripheral portion of the magnetic field generation device is magnetized to a second pole.
11. The molding device according to claim 8 ,
wherein the magnetic field generation device includes a support that has a frame-shaped cross-section and a plurality of permanent magnet pieces that are mounted on the inner surface of the support at a predetermined interval, and
inner and outer surfaces of each of the permanent magnet bodies are magnetized.
12. The melting furnace system according to claim 8 ,
wherein the magnetic field generation device includes a plurality of permanent magnet pieces, and the plurality of permanent magnet pieces are received in the magnetic field generation device receiving chamber at a predetermined interval.
13. The melting furnace system according to claim 9 ,
wherein the magnetic field generation device includes a plurality of permanent magnet pieces, and the plurality of permanent magnet pieces are received in the partial magnetic field generation device receiving chambers, respectively.
14. The molding device according to claim 1 ,
wherein the first electrodes are provided so as to conduct electricity to the liquid-phase melt present in the casting mold, melt conducting electricity to the melt, or other components, and
the second electrode is provided so as to conduct electricity to a solid-phase product taken out from the casting mold and the product.
15. The molding device according to claim 1 ,
wherein both the first and second electrodes are provided so as to conduct electricity to the liquid-phase melt present in the casting mold.
16. The molding device according to claim 1 ,
wherein a power supply, which supplies direct current between the first and second electrodes, is connected to the first and second electrodes.
17. The molding device according to claim 1 ,
wherein a power supply, which supplies alternate current between the first and second electrodes, is connected to the first and second electrodes.
18. The molding device according to claim 17 ,
wherein the power supply has a function of changing frequency.
19. The molding device according to claim 1 ,
wherein the casting mold has a single structure using a non-conductive material, a single structure using a conductive material, or a double structure using a non-conductive material and a conductive material.
20. The molding device according to claim 1 ,
wherein the second electrode includes a roller at the end thereof, and the roller is rotated by coming into contact with the outer surface of the cast product to be taken out.
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PCT/JP2012/052412 WO2013069314A1 (en) | 2011-11-10 | 2012-02-02 | Mold device for continuous casting having stirring device |
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US9364891B2 (en) | 2013-08-08 | 2016-06-14 | Kenzo Takahashi | Molding device for continuous casting with stirring unit |
EP3238855A4 (en) * | 2014-12-26 | 2017-12-13 | Kenzo Takahashi | Method for producing conductive metal sheet and device for producing conductive metal sheet |
US10376951B2 (en) | 2014-12-26 | 2019-08-13 | Kenzo Takahashi | Method of manufacturing conductive metal sheet and apparatus for manufacturing conductive metal sheet |
US10488113B2 (en) | 2014-12-26 | 2019-11-26 | Kenzo Takahashi | Method and device for driving conductive metal |
Also Published As
Publication number | Publication date |
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AU2016201435A1 (en) | 2016-03-24 |
AU2016201435B2 (en) | 2017-11-23 |
EP2650063A4 (en) | 2015-04-22 |
US20180345359A1 (en) | 2018-12-06 |
AU2012337223A1 (en) | 2013-07-18 |
WO2013069314A1 (en) | 2013-05-16 |
JP5431438B2 (en) | 2014-03-05 |
KR20130100210A (en) | 2013-09-09 |
EP2650063B1 (en) | 2018-06-27 |
KR101562876B1 (en) | 2015-10-26 |
NZ612696A (en) | 2016-10-28 |
CN103459064A (en) | 2013-12-18 |
CA2829183C (en) | 2016-06-07 |
CA2829183A1 (en) | 2013-05-16 |
CN103459064B (en) | 2016-01-13 |
JP2013103229A (en) | 2013-05-30 |
AU2012337223B2 (en) | 2016-03-17 |
EP2650063A1 (en) | 2013-10-16 |
US20150343523A1 (en) | 2015-12-03 |
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